Automatic damper



`March 27, 192s, 1,663,718

. C. MIEHLKE AUTOMATIC DAMPER Filed Feb. 14, 1927 Patented Mar. 27, 1928.

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Application. led February 1411927. Serial' No. 168,004; in

Thisinvention `relates to automatic dampers, or draft regulators.;` Objects of'this' invention are'to automatic damper.' which. ,will'` control the draft of a furnace, for instanoe andimaintain the draft at any fixedordesired amount,

irrespective of fluctuations due' to atmos-I pheric conditions.V v

yFurther objects are toprovideja device:l

which is substantiallyVr instantaneously re-` sponsive, and yet does not producefa- Vlolent variation in the draft, Abutfproduces a grad-` -ual variation so that for avgiven-change, a, certain opening of thelsinoke pipe, chimney or similar part of the equ1pment1sleffe'cted,

andV for an increase, afurther openingis secured, ,thusl giving a, graded variation cor- I responding to. the exact fluctuations encountered. Y

In general, th1s11nvent1on1s an improve,-

ment over that disclosed ininy priori-Patent Referring 'to the drawings, yit' will; .be seen l 192e, for

that-:the smokev pipe -1 has heen indicated,`V although it is to be understood that "thede'f vice maybe applied toy a chimney directly, if desired. Inaanyfcas'e, the smoke pipe or chimney 1 is provided with two lateral outlets, as indicated'at 2 and 3, which may be of pipe-like formation. The pipe or outlet 2 extends upwardly at right angles, as indicated at 4, and carries a clap valve 5 pivoted on the side adjacent the fiue pipe 1,'.

as indicated at 6. This valve is provided v with an angularly bent arm 7 whichV extends through the flue pipe and throughthe other lateral outlet or pipe 3. This arm is provided with an upstanding rounded portion 8 for a purpose hereinafter to appear.v The weight of the valve l5 is sufficient to overbalancel the weight of the arm 8, such arm being made relatively light, so that the valve remains closed under ordinary conditions.

The other outlet or pipe 3 carries a vertical pipe or drum 9, which is relatively larger than the portion 4. This drum isV closed at its lower side, and adjacent its upper end is provided with an inwardlyv projecting annular flange 10 against which a disc or main provide an ofthe devicelwith tained.

e 11 moves downwardly.

link, 12-pivoted at itsjupperend to a:bal`anc' i' ing lever The lever i 13- isi .pivoted ini@ ai and is threaded, as indicatedzat 1 5,adjacentY its o'uter,end.I Thisqthreadedouter end car-4 moved -inwardly or outwardly `by .rotating it,

valve orfseats.l This. main valve 1l"I is suSpendedbymeans. offa ,60 clip-gl or bracket14fcarried .by 'the drum` 9,.

'riesan adjustable weight'lG Ewhichniay loefv so. that-the lexact adjustment finay: beA secured.v i Y Obviously loclrino m'ea'ns.k may bezem 'l0 ed"y for. aieiweight, ifhdeSn-ed.' l p y Itjis to -be notedfthatthe detail o'fsupporting the lever 13r'to secure'"t-he-minimum friction is extremely simple. The/bracketl y 14, in reality, is provided with two upwardly. extending arms which: are; bridged-ff.byl v v` a t foldedfmetal: member, 17 :to prevent -inadvertentfremovalrofthe leverf13.L liurther,v

the leveriis notched-,Las indicatedi.at/18,and" rests uponv the upper edge ofthe bracket `or# Y,

fulcrum 14 between thevupwardly extendingI .n arms. Preferably,the bracket 14 i'smadeof the invention; is shown relatively:k hard.- metal; as welll-'as the lever 13,

so Ythat a. knifeflike bearing' edge is secured,

and: i thus InA operation, the smokelpipeiis connected -l This locking means'need not be used; for-"exe yample,if the threads are relativelytight so `as to hold the Weight against inotion.- When the draft increases unduly'the valve or disc main valve is directly controlled bythe'suction in the smoke pipe, so that immediately upon an increase in suction the valve opens slightly and relieves this increase in suction. Inv addition to this, if'La further increase should occur, the main valve will Contact with the rounded upperV portion V8 of the light lever 7 and, consequently, will slightly open the valve 5. Further increase insuction will cause further increase in the opening of the valve 5, so that a graded opening is secured in exact accord with the'deinand. In this manner, the draft he kept substantially uniform and thus the maximu kefficiency `of the furnace attained. v y f The motion of the a f ,ther lire vremains substantially uniform, irre-` system is very small. The result of this is vided with two. opposed laterally extending that the response to variations in suction or draft are substantially instantaneous before any detrimental eect therefrom can occur. Further, itis to be noted that the device may be made with the utmost cheapness and that it is extremely simple and easy to aply. p In the claims, it is to be understood, that the term,smoke pipe is intended to cover either the usual pipe or a chimney, or a similar device.

Although the invention hasbeen described in considerable detail, lsuch description is intended as illustrative rather than limiting as the invention may be variouslyembodied and as the scope of such .invention is to be' Y determined vasclaiined. -v f "I claimrf a Y c l. The. combination of a smoke pipe propipes opening thereinto, an upstanding f drum carried by one of said pipes andprovided .with an upwardly openingvalve con-` trolling admission of air thereto. said valve having a llever extending transversely through the smoke pipe'and through the other of said laterally extending pipes, a relatively larger drum carried by said last Y `mentioned laterally extending pipe,an annular iange carried adjacent the upper end of said drum, a disc-like valve'radapted to contact with the underside of saidflange, and means `for supporting said disc-like valve, whereby itvmay freely float to control the draftv and whereby continued downward motion of `said disc-like valve will cause` suchvalve to contactwith said lever and open said first mentioned valve. d

2;"Ihe combination of a smoke pipe having two opposed vertical chambers communicating therewith, -a downwardly opening valve carried in one of said chambers, lever mechanism urging said valve upwardly, an adjustable weight associated with said le-v verfmechanism, a second valve closing the other of said'vertical chambers and having a lever rigid therewith and Aextending; into proximity to said first mentioned valve, and adapted to be struck by said first mentioned valve upon descent of said first mentioned valve whereby when said first mentioned valve moves downwardly below a predetere mined Ypoint said second valve will open.

3. The'combination of a smoke pipe hav-Y ing a vertical Vvchamber communicating therewith and opening Vthrough its upper end, a downwardly opening valve closing the upe per openendof said 1vertical chamber', mechanisin-'urging said valve'towards closed poeVv sition, and a second valve'opening into said smoke pipe and normally-*remaining-closed, said secondfvalve having mechanism arranged in the path Aof movement4 of said` downwardly opening valve and actuatedV by the downward motion of said Vfirst men'- tioned valve to open said secondy valve.

In testimony that I claim the foregoing I haveher'eunto set my hand at Hartford, in the county-of Washington and State ofy Wisconsin. f Y

l' f CARL .MIEnLirn 

